1961 search results for "twitter"

Le Monde puzzle [48: resolution]

December 4, 2010
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Le Monde puzzle [48: resolution]

The solution to puzzle 48 given in Le Monde this weekend is rather direct (which makes me wonder why the solution for 6 colours is still unavailable..) Here is a quick version of the solution: Consider one column, 1 say. Since 326=5×65+1, there exists one value c with at least 66 equal to c. Among

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Fun with infochimps: Animated Blog Post Hit Map

December 3, 2010
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In a few weeks I will be visiting Chicago, and JD Long—the organizer of the local R users group—has graciously invited me to give a presentation. Ostensibly, the presentation will be on my recently released infochimps package, so I thought it was a good time to start actually putting together some examples and documentation for

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Why I love open source!

December 3, 2010
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Why I love open source!

Today I had a great reminder of why I love open source software and why I spend a bit of my time contributing R code to several packages. In the vegan, I had included some code to do an analysis … Continue reading →

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Data Visualization Practices at the New York Times

December 3, 2010
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Amanda Cox of the New York Times' graphics department recently gave a great presentation to the New Media Days conference in Copenhagen and described how the Times uses data visualizations to reveal patterns, provide context, describe relationships, and even create a sense of wonder about the world. In the video, Amanda demonstrates several of the Times' best interactive visualizations...

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Data Visualization Practices at the New York Times

December 3, 2010
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Amanda Cox of the New York Times' graphics department recently gave a great presentation to the New Media Days conference in Copenhagen and described how the Times uses data visualizations to reveal patterns, provide context, describe relationships, and even create a sense of wonder about the world. In the video, Amanda demonstrates several of the Times' best interactive visualizations...

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Méthodes de Monte-Carlo avec R

December 2, 2010
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Méthodes de Monte-Carlo avec R

The translation of the book Introducing Monte Carlo Methods with R is close to being completed. The copy-editing and page-setting are done, I have received the cover proposal and am happy with it, so it should now go to production and be ready by early January, (earlier than the tentative end of February indicated on

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Random variable generation (Pt 2 of 3)

December 2, 2010
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Random variable generation (Pt 2 of 3)

Acceptance-rejection methods This post is based on chapter 1.4 of Advanced Markov Chain Monte Carlo. Another method of generating random variates from distributions is to use acceptance-rejection methods. Basically to generate a random number from , we generate a RN from an envelope distribution , where .  The acceptance-rejection algorithm is as follows: Repeat until

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Le Monde puzzle [48]

December 1, 2010
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Le Monde puzzle [48]

This week(end), the Le Monde puzzle can be (re)written as follows (even though it is presented as a graph problem): Given a square 327×327 symmetric matrix A, where each non-diagonal entry is in {1,2,3,4,5} and , does there exist a triplet (i,j,k) such that Solving this problem in R is very easy. We can create

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Top 10 things that suck about Sweave

December 1, 2010
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Top 10 things that suck about Sweave

People rave about Sweave and the literate programing paradigm and I am guilty as charged. I speak Sweave, I think Sweave, I dream Sweave. As a matter of fact my default mode of operation is Sweave and anything else is an … Continue reading →

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how to install 64-bit rggobi on Mac OS X 10.5

November 30, 2010
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how to install 64-bit rggobi on Mac OS X 10.5

rggobi is the first package which didn't survive my transition from 32-bit to 64-bit in R 2.11.1. Fortunately, installing the package from source fixes it, and Hadley Wickham has posted the prerequisites and procedure.

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